Interest Group

Organization of people whose members have a common cause for which they seek to influence public policy, without seeking political control.

"interest group, also called special interest group or pressure group, any
association of individuals or organizations, usually formally
organized, that, on the basis of one or more shared concerns, attempts
to influence public policy in its favour.

All interest groups share a desire to affect government policy
to benefit themselves or their cause. It could be a policy that
exclusively benefits group members or one segment of society (e.g.,
government subsidies for farmers) or a policy that advances a broader
public purpose (e.g., improving air quality). Interest groups are a natural outgrowth of the communities of interests" [1]